You don't specify what the virtual machine operating system is.
- If it's Windows, Fusion folder sharing is not implemented in this Tech Preview. This is documented in the Tech Preview Testing Guide, which is linked to from the page you downloaded the Tech Preview from.
- If its Linux, there is a known issue where shared folders are not accessible from the virtual machine..
Please see the unofficial Tips and Techniques guide for workarounds to both of these issues.
- Paul (Technogeezer)
Editor of the Unofficial Fusion Companion Guides